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Detecting and correcting enthalpy wheel failure modes

  • US 9,404,668 B2
  • Filed: 10/06/2011
  • Issued: 08/02/2016
  • Est. Priority Date: 10/06/2011
  • Status: Active Grant
First Claim
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1. A heating, ventilation and cooling system, comprising:

  • an energy recovery ventilator configured to produce an inlet airstream and an exhaust airstream;

    an enthalpy wheel within said energy recovery ventilator operable to transport heat between said inlet and exhaust airstreams;

    a pressure transducer configured to measure an air pressure within said energy recovery ventilator;

    a controller configured to;

    determine outside air temperature;

    record rate of change of pressure data in a region of the energy recovery ventilator;

    determine that the enthalpy wheel is in a frosted condition if the rate of change of the air pressure is greater than a stored normal rate of change of air pressure and the outside air temperature is below a stored temperature value;

    determine that the enthalpy wheel is in a disabled condition if the rate of change of the air pressure is greater than the stored normal rate of change of air pressure and the outside air temperature is higher than the stored temperature value; and

    set the operating speed of an exhaust blower to a predetermined speed based on the determined condition of the enthalpy wheel.

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